header{
    padding: 10px;
    background-color: rgb(60, 181, 255);
}
.head_h1{
    /*height: 100px;*/
    text-align: center;
    font:600 24px '宋体';
}
.main_div{
    background-color: #dcf5ff;
}
.side_left{
    height: 850px;
    width: 200px;
    background-color: rgb(211,227,253);
}
.side_left li{
    height: 50px;
    width: 200px;
    /*vertical-align: center;*/
    padding: 20px;

}
.color{
    background-color: #acd7ff;
}
.hover_color{
    background-color: #a1d0ff;
}

.side_right{
    padding: 30px;

}